WO2022013917A1 - シリコーンゲル組成物、その硬化物、およびそれらの用途 - Google Patents
シリコーンゲル組成物、その硬化物、およびそれらの用途 Download PDFInfo
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- WO2022013917A1 WO2022013917A1 PCT/JP2020/027250 JP2020027250W WO2022013917A1 WO 2022013917 A1 WO2022013917 A1 WO 2022013917A1 JP 2020027250 W JP2020027250 W JP 2020027250W WO 2022013917 A1 WO2022013917 A1 WO 2022013917A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
- H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
- C08G77/08—Preparatory processes characterised by the catalysts used
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- C08K3/16—Halogen-containing compounds
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- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
- C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Definitions
- the present invention relates to a silicone gel composition that provides a cured silicone gel that is cured and has excellent transparency, heat resistance, and particularly crack resistance even when a temperature difference inside a member occurs at high temperatures.
- the present invention also relates to an electronic component encapsulant containing the silicone gel composition and an electronic component provided with the cured silicone gel.
- the silicone gel composition contains an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom (that is, a SiH group), an organopolysiloxane having an alkenyl group such as a vinyl group bonded to a silicon atom, and a platinum-based catalyst. It is an addition reaction curing type organopolysiloxane composition that gives a gel-like cured product with a low crosslink density by an addition reaction of a hydrogen atom bonded to the silicon atom to an alkenyl group (for example, Patent Documents 1 to 3).
- the silicone gel cured product cured by heating this silicone gel composition is excellent in heat resistance, weather resistance, oil resistance, cold resistance, electrical insulation, etc., and has a low elastic modulus and low stress, so that it is in-vehicle. It is used to protect electronic parts such as electronic parts and consumer electronic parts.
- the low elastic modulus and low stress characteristic of the cured silicone gel are not found in other elastomer products. Further, in recent years, there is an increasing demand for heat resistance of a silicone gel material made of a cured silicone gel used for encapsulation due to a demand for high reliability of in-vehicle electronic parts and consumer electronic parts.
- the power semiconductor module used for a power device generates heat during its drive, but the heat source is the bottom surface of the module, and depending on the shape or structure of the device, among the silicone gel cured products required for protection, near the bottom surface of the module. Only exposed to high heat can cause large temperature differences within the same member. The temperature gradient caused by such a temperature difference in the member generates internal stress as a difference in the expansion rate inside the cured silicone gel, and cracks (cracks and cracks) in the cured silicone gel, especially with the passage of time / thermal cycle. ), And there was a problem that the protection function deteriorated.
- the silicone gel composition described in Patent Document 3 and the like provides a cured silicone gel having excellent elastic properties even at a high temperature exceeding 200 ° C., but is a technique for preventing the generation of cracks due to a temperature difference in the member. There is still room for improvement in addressing the issues.
- the present invention has been made in view of the above circumstances, has excellent storage stability, excellent heat resistance and transparency at high temperatures, and has low elastic modulus, low stress, and high transparency even after long-term use at high temperatures. It is possible to maintain the property, and as typified by the case where a heat source of 200 ° C. or higher is installed only on the bottom surface of the cured silicone gel, a large temperature difference occurs inside the member over a long period of time.
- a silicone gel composition that gives a cured silicone gel product that has excellent crack resistance and is less likely to cause deterioration of the gel.
- an electronic component encapsulant made of the silicone gel composition and an electronic component provided with a cured silicone gel obtained by curing the silicone gel composition.
- the inventor of the present invention has found that it is effective to use a branched organohydrogenpolysiloxane having a certain amount or more of branched siloxane units in the molecule as a cross-linking agent to solve the above problems. That is, the present inventor (A) is a branched organopolysiloxane having a viscosity at 25 ° C. in the range of 10 to 10,000 mPa ⁇ s and containing at least two alkenyl groups in the molecule on average.
- B-1) Branched organohydrogenpolysiloxane containing 20 mol% or more of the branched siloxane unit, (B-2) Chained organohydrogenpolysiloxane having two silicon atom-bonded hydrogen atoms in the molecule.
- C) A silicone gel composition containing a platinum-based addition curing catalyst and (D) a reaction product of a specific amount of an alkali metal silanol compound and a cerium salt has been found to be able to solve the above problems, and the present invention has been made. Reached.
- a suitable component (B-2) is a linear organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the end of the molecular chain. .. Further, they have found that the above problems can be solved by an electronic component encapsulant composed of the silicone gel composition and an electronic component provided with a cured silicone gel obtained by curing the silicone gel composition, and have reached the present invention. ..
- the composition of the present invention has excellent storage stability of the silicone gel composition, and after curing, has excellent heat resistance and transparency at high temperatures exceeding 200 ° C., and has a low elastic modulus and low elastic modulus even after long-term use at high temperatures.
- a large temperature difference inside the member over a long period of time, as typified by the case where stress and high transparency can be maintained and a heat source of 200 ° C. or higher is installed only on the bottom surface of the cured silicone gel. Even when the above occurs, it is possible to provide a cured silicone gel product in which cracks are unlikely to occur.
- an electronic component encapsulant made of the silicone gel composition and an electronic component provided with the silicone gel cured product is possible to provide.
- the cured silicone gel composition obtained by curing the silicone gel composition of the present invention is transparent even at a high temperature of 200 ° C. or higher as required for SiC semiconductors when used for protecting electronic components such as ICs and hybrid ICs. Since it is excellent in heat resistance and cold resistance, it can be expected to improve long-term durability, and problems such as cracks occur even under usage conditions where a large temperature difference occurs inside the cured silicone gel due to the arrangement of heat sources. It is possible to provide highly reliable and highly durable electronic components because it is unlikely to cause deterioration over time.
- the silicone gel composition of the present invention By using the silicone gel composition of the present invention and this cured product, there is a high degree of freedom in circuit design including the arrangement of heat sources and the temperature gradient inside the member, and heat resistance and cold resistance are particularly required, and the environment is harsh.
- a method of protecting the semiconductor chip used below can be provided.
- the semiconductor chip obtained by the above protection method is more reliable and durable than the conventional silicone gel protection method even when used in outer space, high latitude area, extreme environment, etc. Functions as a sex electronic component.
- the viscosity is a value measured at 25 ° C. using a B-type viscometer in accordance with JIS K7117-1.
- Organopolysiloxane having an alkenyl group is one of the main agents (base polymers) of a silicone gel composition, and is within the range of 10 to 10,000 mPa ⁇ s. It is characterized by having an alkenyl group bonded to at least two silicon atoms on average in the molecule. More specifically, the component (A) is any one of the following components (A-1) and (A-2) or a mixture thereof, and optionally contains an (A-3) alkenyl group. It may contain an organopolysiloxane resin.
- a mixture of the components (A-1) and the component (A-2) from the viewpoint of achieving both cold resistance and mechanical strength of the cured silicone gel.
- the branched organopolysiloxane is one of the main agents (base polymers) of the silicone gel composition, and is in the range of 10 to 10,000 mPa ⁇ s. It has an internal viscosity, contains an alkenyl group bonded to at least two silicon atoms on average in the molecule, and preferably contains a constant amount of RSiO 3/2 (in the formula, R is a monovalent hydrocarbon). Group) It is characterized by having a structure branched by a unit.
- the silicone gel composition of the present invention can provide a cured silicone gel having excellent cold resistance even at a low temperature of -40 ° C or lower, in addition to the crack resistance described above. Further, when used in combination with the component (D), it has excellent heat resistance and transparency at high temperatures exceeding 200 ° C., and can maintain low elastic modulus, low stress and high transparency even after long-term use at high temperatures. A cured silicone gel can be given.
- the branched organopolysiloxane can be represented by the following average structural formula (1): (R 3 SiO 1/2 ) l (R 2 SiO 2/2 ) m (RSiO 3/2 ) n (1)
- R represents a monovalent hydrocarbon group.
- n is a number of 1 or more, and l + m + n + p is preferably 200 or less.
- the branched organopolysiloxane preferably has a specific amount of branched structure in order to impart good cold resistance to the cured silicone product of the present invention.
- (A-1) of all the siloxane units constituting the molecule of branched organopolysiloxanes is 80.0 to 99.8 mol% is R 2 SiO 2/2 units, 0.1 to 10.0 mol% is RSiO 3/2 units, it is preferably 0.1 to 10.0 mol% is R 3 SiO 1/2 units. That is, the ratio of m: n: l in Equation 1 is preferably 80.0 to 99.8: 0.1 to 10.0: 0.1 to 10.0.
- n: l is more preferably 80.0 to 98.9: 1.0 to 10.0: 0.1 to 10.0, and even more preferably 80.0 to 96.9: 3. 0 to 10.0: 0.1 to 10.0.
- A-1 When the branched organopolysiloxane has such a branched structure, it is possible to obtain a cured silicone gel product having excellent cold resistance, particularly at low temperatures.
- the molar ratios of R 2 SiO 2/2 units, RSiO 3/2 units, and R 3 SiO 1/2 units of all siloxane units of (A-1) branched organopolysiloxane are nuclear magnetic resonance (NMR). ) Is the value measured and obtained.
- (A-1) In a branched organosiloxane, a monovalent hydrocarbon group bonded to a silicon atom in a polysiloxane structural unit, which is a side chain or a terminal group of the main chain or the branched chain (that is, the above-mentioned R).
- a monovalent hydrocarbon group bonded to a silicon atom in a polysiloxane structural unit which is a side chain or a terminal group of the main chain or the branched chain (that is, the above-mentioned R).
- an unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated bond, or a monovalent alkenyl group can be mentioned.
- the monovalent hydrocarbon group R bonded to the silicon atom is an unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated bond
- the number of carbon atoms thereof is usually 1 to 10, preferably 1.
- the branched organopolysiloxane has an alkenyl group bonded to at least two silicon atoms in the molecule (hereinafter, also referred to as "silicon atom-bonded alkenyl group").
- Such an alkenyl group is usually an alkenyl group having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms, more preferably 2 to 3 carbon atoms, and particularly preferably a vinyl group.
- (A-1) Of all the monovalent hydrocarbon groups R bonded to the silicon atom in the above average structural unit of the branched organopolysiloxane, 0.10 to 4.00 mol% are silicon atom-bonded alkenyl groups. It is more preferable that 0.25 to 4.00 mol% is a silicon atom-bonded alkenyl group, and 0.50 to 2.00 mol% is further preferably a silicon atom-bonded alkenyl group.
- (A-1) The flexibility of the branched organopolysiloxane containing such an amount of silicon atom-bonded alkenyl groups so that the direct reading value of 1/4 consistency specified by JIS K2220 is in the range of 10 to 150. A cured silicone gel can be obtained.
- the amount of the alkenyl group in (A-1) branched organopolysiloxane is a value quantified using a Fourier transform type near-infrared spectrophotometer.
- the branched organopolysiloxane has a viscosity in the range of 10 to 10,000 mPa ⁇ s at 25 ° C.
- the viscosity of the (A-1) branched organopolysiloxane is in the range of 10 to 5,000 mPa ⁇ s at 25 ° C., and more preferably in the range of 10 to 1,000 mPa ⁇ s.
- the (A-1) branched organopolysiloxane having such a viscosity has good handling workability and fluidity of the composition, and the strength of the obtained cured product is good.
- the branched organopolysiloxane can be synthesized by a known method with a desired viscosity and design structure.
- a hydrolyzate having each siloxane unit of RSiO 3/2 , R 2 SiO 2/2 , and R 3 SiO 1/2.
- ViR 2 SiOSiR 2 Vi and cyclic polysiloxane (R 2 SiO) n are potassium silanolates. It can be prepared by heating and equilibrium polymerization in the presence.
- A-2) Linear organopolysiloxane (A-2)
- the linear organopolysiloxane as a component is one of the main agents (base polymers) of the silicone gel composition, and has a concentration of 10 to 10,000 mPa ⁇ s. It has a viscosity within the range and contains an alkenyl group bonded to at least two silicon atoms on average in the molecule.
- the linear organopolysiloxane can be represented by the following average structural formula (2): (R 3 SiO 1/2 ) p (R 2 SiO 2/2 ) q (2)
- R represents the same group as the monovalent hydrocarbon group in the general formula (1) of the component (A) described above.
- p and q each represent an integer of 1 or more, and p + q is preferably 500 or less.
- NMR nuclear magnetic resonance
- organopolysiloxane represented by the above average structural formula (2) examples include both-ended dimethylvinylsiloxy group-blocked dimethylpolysiloxane, both-ended dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer, and both-ended trimethyl.
- dimethylpolysiloxane may be used alone as the component (A), but it is possible to achieve both cold resistance and mechanical strength by using it in combination with the component (A-1) or the phenyl group-containing polysiloxane described later. Become.
- both-ended dimethylvinylsiloxy group-blocked dimethylsiloxane / diphenylsiloxane copolymer both-ended dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymer
- both-ended trimethylsiloxy group-blocked dimethylsiloxane / vinylmethyl Siloxane / diphenylsiloxane copolymer terminal trimethylsiloxy group / dimethylvinylsiloxy group blocked dimethylsiloxane / diphenylsiloxane copolymer
- terminal trimethylsiloxy group / dimethylvinylsiloxy group sealed dimethylsiloxane / diphenylsiloxane / methylvinylsiloxane copolymer Double-ended methyldivinylsiloxy group-blocked dimethylsiloxane
- the content of the phenyl group is in the range of 1 to 10 mol% with respect to the total functional group bonded to the silicon atom. It is preferably in the range of 3 to 7 mol%.
- the content of the phenyl group exceeds the above upper limit, the hardness of the silicone gel may increase due to the phenyl group in the cured product, and the flexibility of the gel may be impaired. It can be difficult to form a silicone gel with the low hardness required for relaxation properties. Further, if the content of the phenyl group is less than the above lower limit, it may not be possible to impart sufficient cold resistance to the silicone gel having a dimethylpolysiloxane skeleton.
- a silicone obtained by curing the silicone gel composition of the present invention by adding the above-mentioned dimethylpolysiloxane with a phenyl group-containing organopolysiloxane as a main component It is possible to improve the mechanical strength of the gel. Even in this case, the content of the phenyl group is preferably within the above range. In particular, if the content of the phenyl group exceeds the above upper limit, it becomes difficult to mutually dissolve with the dimethylpolysiloxane used in combination, and the uniformity of the entire composition may be impaired.
- (A-2) In the linear organopolysiloxane, 0.25 to 4.00 mol% of all monovalent hydrocarbon groups R bonded to silicon atoms in the structural unit are silicon atom-bonded alkenyl groups. It is more preferable that 0.50 to 3.00 mol% is a silicon atom-bonded alkenyl group, and further preferably 1.00% to 2.00 mol% is a silicon atom-bonded alkenyl group. (A-2) Since the linear organopolysiloxane contains such an amount of silicon atom-bonded alkenyl group, the direct reading value of 1/4 consistency defined by JIS K2220 is in the range of 10 to 150. A cured silicone gel product having properties can be obtained.
- the amount of alkenyl groups in (A-2) linear organopolysiloxane is a value quantified using a Fourier transform type near-infrared spectrophotometer.
- the linear organopolysiloxane has a viscosity at 25 ° C. in the range of 1.0 to 10,000 mPa ⁇ s, preferably in the range of 1.0 to 1000 mPa ⁇ s, more preferably. Is in the range of 5.0 to 500 mPa ⁇ s.
- the (A-2) linear organopolysiloxane having such a viscosity can impart good handling workability and fluidity to the composition, and can impart good strength to the obtained cured product.
- the dimethylpolysiloxane-based (A-2) component is 2 to 150 parts by mass, more preferably 2 parts by mass with respect to 100 parts by mass of the (A-1) component or the (A-2) component containing a phenyl group. ⁇ 100 parts by mass.
- the organoposiloxane resin (A-3) component contains at least two alkenyl groups in the molecule on average, and is represented by RSiO 3/2 (in the formula, R is a monovalent organic group).
- the organopolysiloxane resin contains at least 20 mol% or more of the siloxane unit selected from the siloxane unit and the siloxane unit represented by SiO 4/2.
- the alkenyl group in the component (A-3) has a hydrosilylation reactivity, it can be expected to have an effect of being incorporated into a cross-linking reaction forming a silicone gel and improving the mechanical strength of the obtained gel.
- Such an alkenyl group is a similar group as described above, and is particularly preferably a vinyl group or a hexenyl group.
- Examples of the group bonded to the silicon atom other than the hydrosilylation-reactive group in the component (A-3) include an alkyl group having 1 to 20 carbon atoms, a halogen-substituted alkyl group having 1 to 20 carbon atoms, and a group having 6 to 20 carbon atoms.
- Examples thereof include an aryl group, a halogen-substituted aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an alkoxy group, and a hydroxyl group, and an alkyl group is exemplified from the viewpoint of intersolubility with other components contained in the composition.
- a group, particularly a methyl group, is preferred.
- the amount of the component (A-3) added is arbitrary, but it can be added in a range of 0.0 to 10.0% by mass with respect to the entire composition, preferably 0.1 to 7.5. It is added in an amount of% by mass, particularly preferably 0.1 to 5.0% by mass.
- the amount of the component (A-3) is less than 0.10% by mass, the effect of improving the mechanical strength cannot be obtained, and conversely, if it exceeds 10.0% by mass, the cured silicone gel becomes hard. Not only is it too high, but the viscosity of the resulting composition at 25 ° C. may be too high, which is not preferable in practice.
- the branched organohydrogenpolysiloxane of the component (B-1) is one of the characteristic components of the present invention, and reacts with the above component (A) to react with the component (A).
- it By acting as a cross-linking agent for the present composition, it is a component that effectively suppresses crack resistance (particularly cracks and breakage due to internal stress due to temperature difference inside the member) of the obtained cured silicone gel. ..
- Such a branched organohydrogenpolysiloxane has a viscosity in the range of 2 to 1000 mPa ⁇ s, has a hydrogen atom bonded to at least three silicon atoms in the molecule, and has R'SiO 3/2. Alternatively, it contains at least 20 mol% or more of the siloxane unit represented by SiO 4/2 in the total siloxane unit.
- Organohydrogenpolysiloxane has at least three hydrogen atoms (SiH groups) bonded to silicon atoms in one molecule.
- the number of silicon atom-bonded hydrogen atoms (SiH groups) contained in one molecule of such a branched organohydrogenpolysiloxane is preferably 3 to 500, more preferably 4 to 200, still more preferably 5 to 100. Particularly preferably, the number is 10 to 80.
- the amount of silicon atom-bonded hydrogen atom in the organohydrogenpolysiloxane can be measured by an infrared spectroscope.
- the branched organohydrogenpolysiloxane must contain at least 20 mol% or more of the siloxane unit represented by R'SiO 3/2 or SiO 4/2 in its molecule. If the amount of these branching units is less than the lower limit, sufficient crack resistance may not be realized.
- the organohydrogenpolysiloxane as the component (B-1) has the following average unit formula: (R'3 SiO 1/2) q ( R'2 SiO 2/2) r (R'SiO 3/2) s (SiO 4/2) t (R''O 1/2) u It is a branched organohydrogenpolysiloxane represented by.
- each R' is the same or different monovalent hydrocarbon group or hydrogen atom having 1 to 10 carbon atoms having no aliphatic unsaturated carbon bond, except that at least 3 in one molecule.
- R' is a hydrogen atom.
- the monovalent hydrocarbon group R'other than the hydrogen atom is preferably a methyl group or a phenyl group.
- R ′′ is an alkyl group having a hydrogen atom or 1 to 10 carbon atoms, is a hydrogen atom, a methyl group or an ethyl group, and forms a hydroxyl group, a methoxy group or an ethoxy group as OR ′′.
- the organohydrogenpolysiloxane resin which is a part of the component (d2) is specifically MH MT resin, MH MTT H resin, MH MTQ resin. , MH MQ resin, MH MTT H Q, MH Q resin are preferable.
- the organohydrogenpolysiloxane of the component (B-1) is (H (CH 3 ) 2 SiO 1/2 ) l1 (SiO 4/2 ) p1 It is an MH Q resin represented by.
- l1 + p1 1, 0.1 ⁇ l1 ⁇ 0.80, and 0.20 ⁇ p1 ⁇ 0.90.
- the content of the branched organopolysiloxane of the component (B-1) is preferably an amount in which the number of hydrogen atoms bonded to the silicon atom is 0.1 to 0.8 with respect to one alkenyl group of the component (A). , 0.2 to 0.75 pieces are more preferable.
- B-1 By setting the content of the branched organohydrogenpolysiloxane in the silicone gel composition within this range, the crack resistance to the internal stress generated by the temperature gradient in the silicone gel can be improved. .. If the number of silicon atom-bonded hydrogen atoms from the component (B-1) is less than the above lower limit with respect to one alkenyl group of the component (A), sufficient crack resistance cannot be obtained. On the other hand, if it is more than the upper limit, the crosslink density of the obtained silicone gel becomes too high and the crack resistance is lowered.
- the organohydrogenpolysiloxane has a viscosity at 25 ° C. in the range of 2.0 to 1,000 mPa ⁇ s, preferably in the range of 2.0 to 500 mPa ⁇ s, more preferably. Is in the range of 2.0 to 150 mPa ⁇ s.
- the (B) organohydrogenpolysiloxane having such a viscosity has good handling workability and fluidity of the composition, and the strength of the obtained cured product is good.
- (B-2) Chained Organohydrogenpolysiloxane
- the chained organohydrogenpolysiloxane of the component (B-2) reacts with the above-mentioned component (A) together with the above-mentioned component (B-1) to form the present composition. It acts as a cross-linking agent.
- Such a chain organohydrogenpolysiloxane has a viscosity in the range of 2 to 1000 mPa ⁇ s and has a hydrogen atom bonded to two silicon atoms.
- Organohydrogenpolysiloxane has a chain-like structure, preferably a linear structure, and contains two hydrogen atoms (SiH groups) bonded to silicon atoms in one molecule.
- the position of the SiH group is preferably at both ends of the chain.
- Such a (B-2) chain organopolysiloxane can be preferably represented by the following average structural formula 4.
- R represents a group similar to the monovalent hydrocarbon group having 1 to 10 carbon atoms having no aliphatic unsaturated carbon bond in the above-mentioned component (B-1), and from an industrial point of view. , Methyl or phenyl groups are preferred.
- v is a number of 1 or more, and 2 + v is preferably 500 or less.
- the linear organohydrogenpolysiloxane has a viscosity at 25 ° C. in the range of 2.0 to 1,000 mPa ⁇ s, preferably in the range of 2.0 to 500 mPa ⁇ s. , More preferably in the range of 2.0 to 150 mPa ⁇ s.
- the (B) organohydrogenpolysiloxane having such a viscosity has good handling workability and fluidity of the composition, and the strength of the obtained cured product is good.
- Examples of such (B-2) chain organohydrogenpolysiloxane include (H (Me) 2 SiO 1/2 ) (Me 2 SiO 2/2 ) v1 (SiO 1/2 (Me) 2 H).
- An example is dimethylpolysiloxane in which both ends of the molecular chain represented by are sealed with a dimethylhydrogensiloxy group.
- v1 is a number whose viscosity at 25 ° C. is in the range of 2.0 to 500 mPa ⁇ s, more preferably in the range of 2.0 to 150 mPa ⁇ s, and Me is a methyl group.
- the following chain organohydrogenpolysiloxane is also exemplified as another (B-2) component.
- Me and Ph represent a methyl group and a phenyl group, respectively
- v2 is an integer of 1 to 100
- v3 is an integer of 1 to 50.
- the content of the chain organohydrogenpolysiloxane in the silicone gel composition is 0 to 0.9 hydrogen atoms bonded to silicon atoms with respect to one alkenyl group of the component (A).
- the amount is preferably 0.1 to 0.9, and more preferably 0.1 to 0.9.
- the use of the component (B-2) is optional, but it is mainly used to bring the number of hydrogen atoms bonded to the silicon atom to one alkenyl group of the component (A) in the composition close to 1.0. Will be done. As described above, when the ratio of the alkenyl group to the SiH group in the composition of the component (B-1) alone is brought close to 1.0: 1.0, the crosslink density tends to be too high and the crack resistance tends to decrease. Therefore, (B-2) By using the components together, the total number of hydrogen atoms bonded to silicon atoms per alkenyl group bonded to silicon atoms in the entire silicone gel composition is adjusted to the content in 0.7 to 1.2.
- a cured silicone gel product having excellent heat resistance and physical properties can be obtained. If the number of silicon atom-bonded hydrogen atoms derived from the component (B-2) is more than the upper limit with respect to 1.0 alkenyl group in the component (A), the heat resistance of the cured product may decrease. Further, when the component (B-2) is not used, or when the upper limit of the above-mentioned amount is exceeded, the curability or physical properties of the obtained cured silicone gel may be significantly deteriorated, which is not preferable.
- the total number of hydrogen atoms bonded to the silicon atoms in the component (B-1) and the component (B-2) is in the range of 0.7 to 1.2, preferably 0.8 to 1.0. It is a range to be an individual.
- the component (C) of the present invention is a silicon atom-bonded alkenyl group in the component (A) and a silicon atom-bonded hydrogen in the components (B-1) and (B-2). It is used as a catalyst to promote an addition reaction with an atom (that is, a hydrosilylation reaction).
- a known platinum-based (platinum or a compound containing platinum) compound can be used, and a platinum-alkenylsiloxane complex is particularly preferable because it has a high effect of promoting the hydrosilylation reaction.
- a 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex is particularly preferred.
- hydrosilylation reaction catalysts may be used alone or in combination of two or more.
- the component (C) may be used by dissolving it in an organosiloxane oligomer such as an alkenylsiloxane oligomer or a dimethylsiloxane oligomer.
- the platinum-based addition reaction catalyst as the component (C) is a catalyst dispersed or encapsulated in a thermoplastic resin such as a silicone resin, a polycarbonate resin, or an acrylic resin. It may be a thermoplastic resin fine particle containing a platinum-containing hydrosilylation reaction catalyst. Further, a part or all of the platinum-based addition reaction catalyst as the component (C) does not show activity without irradiation with high energy rays, but a hydrosilylation reaction showing activity in the composition by irradiation with high energy rays.
- It may be a catalyst for high energy ray activation or a photoactivation catalyst typified by (methylcyclopentadienyl) trimethyl platinum (IV), bis (2,4-pentandionato) platinum (II) and the like. It may be.
- the blending amount of the component (C) may be an effective amount and may be appropriately increased or decreased depending on the desired curing rate, but usually, the amount of the platinum-based metal is usually 0.1 to 1, with respect to the mass of the entire composition. It is in the range of 000 ppm, preferably 1 to 300 ppm. Even if this compounding amount exceeds the upper limit of the above range, there is no advantage in terms of curing rate, and it is economically disadvantageous in terms of the price (cost) of platinum.
- (D) A reaction product of at least one cerium salt selected from (d1) alkali metal silanolate and (d2) cerium chloride or a cerium carboxylate component (D) enhances the heat resistance of the composition. Used for It is particularly preferable that the reaction product of the component (D) contains 0.5 to 5.0% by mass of cerium (metal). Further, (d1) alkali metal silanolate is a reaction product obtained by ring-opening reaction of (d1-1) one or more kinds of cyclic organopolysiloxanes with (d1-2) alkali metal hydroxide to (d1).
- the alkali metal silanolate compound is obtained by further reacting an organopolysiloxane having a viscosity at 25 ° C. in the range of 10 to 10000 mPa ⁇ s.
- the cyclic organopolysiloxane of the component (d1-1) is not particularly limited, and examples thereof include cyclic organopolysiloxane having the following general formula (3).
- R represents the same group as the monovalent hydrocarbon group in the general formula (1) of the component (A) described above.
- s and t are integers of 0 to 8, respectively, where 3 ⁇ m + n ⁇ 8.
- Examples of the cyclic organopolysiloxane (d1-1) include hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), 1, 1-diethylhexamethylcyclotetrasiloxane, phenylheptamethylcyclotetrasiloxane, 1,1-diphenylhexamethylcyclotetrasiloxane, 1,3,5,7-tetravinyltetramethylcyclotetrasiloxane, 1,3,5,7 -Tetramethylcyclotetrasiloxane, 1,3,5,7-Tetracyclohexyltetramethylcyclotetrasiloxane, Tris (3,3,3-trifluoropropyl) trimethylcyclotrisiloxane, 1,3,5,7-
- the alkali metal hydroxide as the component (d1-2) is not particularly limited, and examples thereof include sodium hydroxide and potassium hydroxide.
- the amount of the (d1-2) component is not particularly limited, but is generally 0.1 part by mass to 10.0 parts by mass with respect to 100 parts by mass of the (d1-1) component.
- the organopolysiloxane of the component (d1-3) may be any conventionally known organopolysiloxane having a viscosity at 25 ° C. in the range of 100 to 1,000,000 mPa ⁇ s, which is substantially diorganopoly. It is mainly a repeating siloxane unit (linear structure), and is a linear or branched one that keeps a liquid at room temperature.
- the organic group bonded to this silicon atom (that is, an unsubstituted or substituted monovalent hydrocarbon group) can be the same as that exemplified as R in the general formula (1) of the component (A), and is methyl. Groups, phenyl groups or 3,3,3-trifluoropropyl groups are preferred.
- the organopolysiloxane has a trialkyl syroxy group such as a trimethyl syloxy group, an alkenyl dialkyl syroxy group such as a vinyl dimethyl syroxy group, a dialkenyl alkyl syroxy group such as a divinyl methyl syroxy group, a trivinyl syroxy group, etc.
- a triorganosyloxy group such as a trialkenylsiloxy group, a hydroxyl group, an alkoxy group, or the like.
- the viscosity of the organopolysiloxane of the component (d1-3) is in the range of 10 to 10,000 mPa ⁇ s, preferably in the range of 50 to 1,000 mPa ⁇ s at 25 ° C.
- the amount of the (d1-3) component is not particularly limited, but is generally 0.1 part by mass to 10 parts by mass with respect to 100 parts by mass of the (d1-1) component.
- the cerium salt of the component (d2) is cerium chloride or a cerium carboxylate, and the cerium carboxylate is represented by the general formula: (R 4 COO) n M 1 .
- R 4 is a monovalent hydrocarbon group of the same kind or a different kind
- M 1 is a rare earth element mixture containing cerium or cerium as a main component, and is 2-ethylhexanoic acid, naphthenic acid, oleic acid, lauric acid, and stearic acid.
- Cerium salts such as are exemplified.
- the carboxylate of cerium is often used as an organic solvent solution because of its ease of handling, and the organic solvent includes petroleum solvents such as standard solvent, mineral spirit, ligroine, and petroleum ether. , Toluene, xylene and other aromatic solvents are exemplified.
- the amount of the cerium salt of the component (d2) is not particularly limited, but the amount of cerium is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the total amount of the component (d1), preferably 0.1. An amount of up to 3 parts by mass is more preferable.
- the component (D) is added in an amount of 0.20 parts by mass to 10.0 parts by mass, preferably 0.2 to 5.0 parts by mass, and particularly preferably 0, with respect to 100 parts by mass of the component (A). .20 to 0.5 parts by mass, more specifically, added in small amounts of about 0.2 parts by mass, 0.3 parts by mass, and 0.4 parts by mass. Further, the amount of the component (D) added is preferably such that the content of the cerium metal in the component (D) is 0.005 to 0.15% by mass, and 0.01 to 0. An amount of 1% by mass is more preferable. Keeping the amount of the component (D) within this range is advantageous in terms of heat resistance of the obtained silicone gel composition.
- the amount of the component (D) added is less than 0.20 parts by mass, the effect of improving the heat resistance at high temperature is not seen, and conversely, when it exceeds 15 parts by mass, the transparency of the cured silicone gel is lowered. In addition, the cost of the silicone gel composition increases, which is economically disadvantageous.
- the component (D) can be obtained by mixing the components (d1) and (d2) and then heat-treating at a temperature of 150 ° C. or higher.
- the heating temperature in the heat treatment is preferably 150 to 310 ° C., more preferably 200 to 305 ° C., and even more preferably 250 to 300 ° C. If the heating temperature is less than 150 ° C, it is difficult to obtain a uniform composition, and if it exceeds 310 ° C, there is a problem that, for example, the thermal decomposition rate of the component (d1-3) increases.
- any component can be added to the composition of the present invention as long as the object of the present invention is not impaired.
- this optional component include a reaction inhibitor, an inorganic filler, an organopolysiloxane containing no silicon atom-bonded hydrogen atom and a silicon atom-bonded alkenyl group, an adhesion-imparting agent, a heat-resistant imparting agent, a flame-retardant-imparting agent, and a thixo.
- examples include sex-imparting agents, pigments, dyes and the like.
- the adhesion-imparting agent is a component that improves the adhesiveness of the silicone gel to a substrate or the like, and is, for example, a silane coupling agent; tetraethyl titanate, tetrapropyl titanate, tetrabutyl titanate, tetra (2-ethylhexyl) titanate, titanium ethyl. Titanium compounds such as acetonate and titanium acetylacetonate; ethylacetacetate aluminum diisopropyrate, aluminum tris (ethylacetacetate), alkylacetate acetate aluminum diisopropyrate, aluminum tris (acetylacetonate), aluminum monoacetylacetonate bis.
- Aluminum compounds such as (ethylacetacetate); zirconium compounds such as zirconium acetylacetonate, zirconium butoxyacetylacetonate, zirconium bisacetylacetonate, zirconium ethylacetacetate; silanes disclosed in Japanese Patent Application Laid-Open No. 2002-322364; It may contain an organic silicon compound selected from a partially hydrolyzed condensate.
- These adhesion-imparting agents are substantially transparent when the silicone gel cured product containing the adhesion-imparting agent according to the present invention is evaluated by the method described in the section of Examples of the present application, and are defined by JIS K22201.
- the adhesive-imparting agent may be used by selecting an adhesive-imparting agent or a quantitative range in which the type and amount thereof do not reduce the transparency of the cured silicone gel or cause curing inhibition. It is preferable, and it is most preferable to use the above-mentioned titanium compound, silane disclosed in JP-A-2002-322364, or a partially hydrolyzed condensate thereof, or a combination thereof.
- the content of the above-mentioned adhesive-imparting agent is not limited, but is preferably in the range of 0.001 to 5.0% by mass with respect to the entire composition.
- the reaction inhibitor is a component for suppressing the hydrosilylation reaction of the silicone gel composition, and specifically, for example, an acetylene-based, amine-based, carboxylic acid ester-based, or phosphite acid such as ethynylcyclohexanol. Examples thereof include ester-based reaction inhibitors.
- the amount of the reaction inhibitor added is usually 0.001 to 5% by mass based on the total amount of the silicone gel composition.
- inorganic filler examples include fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, and calcium carbonate.
- Inorganic fillers such as zinc carbonate, layered mica, carbon black, diatomaceous earth, glass fiber; these fillers are made of organic silicon compounds such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds, and low molecular weight siloxane compounds. Examples thereof include fillers that have been surface-hydrophobicized. Further, silicone rubber powder, silicone resin powder and the like may be blended.
- the silicone gel composition when low viscosity and transparency are required for the silicone gel composition, it is preferable not to add an inorganic filler, but even if it is added, the amount of the composition is 20% by mass or less, particularly 10% by mass or less. Is preferable.
- the silicone gel composition of the present invention can be prepared by mixing the above components (A) to (D) (including any component, if any component is blended) according to a conventional method.
- the components to be mixed may be divided into two or more parts as needed and mixed, for example, a part of the component (A) and the components (C) and (D). It is also possible to prepare a part by dividing it into a part and a part consisting of the rest of the component (A) and the component (B), mixing them, and then mixing these two parts.
- any part contains the above-mentioned reaction inhibitor as an optional component.
- each component of the silicone composition is not particularly limited by a conventionally known method, but usually, a uniform mixture is obtained by simple stirring. Further, when a solid component such as an inorganic filler is contained as an optional component, mixing using a mixing device is more preferable.
- a mixing device is not particularly limited, and examples thereof include a uniaxial or biaxial continuous mixer, a double roll, a loss mixer, a hobart mixer, a dental mixer, a planetary mixer, a kneader mixer, and a Henschel mixer.
- the silicone gel composition thus obtained is excellent in storage stability and can be suitably used as a sealing agent for electronic parts.
- this silicone gel composition as a sealing agent for semiconductor chips, even in a harsh environment where excellent heat resistance is required, the semiconductor chip does not have a problem of cracks due to a heat source or local heating. Can be effectively protected.
- the cured silicone gel is a silicone gel, and can be prepared by curing the silicone gel composition of the present invention at room temperature or under temperature conditions suitable for the intended use.
- the temperature condition for curing this silicone composition is not particularly limited, but is usually in the range of 60 ° C to 150 ° C.
- the cured silicone gel has excellent heat resistance and transparency at high temperatures exceeding 200 degrees Celsius, can maintain low elastic modulus, low stress and high transparency even after long-term use at high temperatures, and is a high-temperature heat source.
- the silicone gel cured product is installed on only one surface (for example, the bottom surface), even if the silicone gel cured product is left in a state where only one direction is exposed to high temperature for a long time, the inside of the member It has the property that defects such as cracks are unlikely to occur in the cured silicone gel due to the temperature difference and internal stress.
- an electronic component such as semiconductor chips, SiC semiconductor chips, ICs, hybrid ICs, and power devices
- it is expected to improve long-term durability because it maintains transparency even at high temperatures and has excellent heat resistance.
- it does not easily deteriorate even at low temperatures, so it has the advantage of being able to provide highly reliable and highly durable electronic components even under harsh usage conditions with large temperature differences.
- an electronic component provided with a cured silicone gel as a sealant or the like has high reliability and high durability even under severe usage conditions with a large temperature difference.
- the semiconductor chip includes a light emitting semiconductor element such as an LED.
- the cured silicone gel has a direct reading value of 1/4 consistency (reading unit is 1/10 mm) specified by JIS K2220 preferably in the range of 10 to 150, and preferably in the range of 20 to 120. It is more preferable, and it is further preferable to satisfy the range of 30 to 100.
- a silicone gel cured product having a direct reading value of 1/4 consistency specified by JIS K2220 in such a range has the characteristics of a silicone gel cured product such as low elastic modulus and low stress. When the degree of needle penetration is less than 10, it is difficult to exhibit the characteristics of the cured silicone gel such as low elastic modulus and low stress, and when it exceeds 150, the form as the cured silicone gel is maintained. It is difficult to do and it will flow.
- the "1/4 consistency direct reading value" is the surface of the sample, as in the case of the needle insertion test with the 1/4 cone specified by JIS K2220, using the 1/4 consistency meter of JIS K2220. It is a value obtained by dropping a 1/4 cone from the above and reading the depth at which this cone has entered.
- the silicone gel cured product is substantially transparent. “Substantially transparent” means, for example, that a silicone gel composition is gently poured into an aluminum cup to a thickness of 10 mm, and then heated to prepare a silicone gel cured product having a thickness of 10 mm, and the silicone gel is cured. It means that the bottom surface of the aluminum cup is transparent enough to be visually observed from the top surface. Since the cured silicone gel has such transparency, it is useful as a sealing agent for semiconductors such as power devices.
- the silicone gel composition and the cured silicone product of the present invention will be described in detail with reference to Examples.
- the present invention is not limited to the description of the following examples as long as the gist of the present invention is not exceeded.
- the viscosity in the examples is a value at 25 ° C.
- Component D was synthesized by the following method. 60 g of a potassium silanolate compound prepared by ring-opening a mixture of hexamethylcyclotrisiloxane and octamethylcyclotetrasiloxane with potassium hydroxide, and 120 g of dimethylpolysiloxane, which is a trimethylsiloxy group-sealed trimethylsiloxy group at both ends of a molecular chain having a viscosity of 20 mPa ⁇ s. And hexamethylphosphoamide (0.5 g) was added and reacted at 115 ° C. for 2 hours under a nitrogen stream to prepare a potassium silanolate compound.
- a potassium silanolate compound prepared by ring-opening a mixture of hexamethylcyclotrisiloxane and octamethylcyclotetrasiloxane with potassium hydroxide
- dimethylpolysiloxane which is a trimethylsiloxy
- Examples 1 to 11 and Comparative Examples 1 to 5 The following components were uniformly mixed in the composition (part by weight) shown in Table 1 to prepare 16 kinds of silicone gel compositions. These silicone gel compositions were cured by the methods described in the respective evaluation methods described above, and the 1/4 consistency, heat resistance, and crack resistance of the obtained cured silicone gel composition were evaluated, and the results were as follows. It is summarized in Table 1 and Table 2.
- the number of moles of the silicon atom-bonded hydrogen atom in the component and the total of the component (B-1) and the component (B-2) is shown.
- the platinum metal content in the composition is shown in ppm in the table.
- Component D A reaction product of alkali metal silanolate and cerium chloride prepared by the above method
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Abstract
Description
(A)アルケニル基を有するオルガノポリシロキサン
(A)成分のアルケニル基を有するオルガノポリシロキサンは、シリコーンゲル組成物の主剤(ベースポリマー)の一つであり、10~10,000mPa・sの範囲内の粘度を有し、分子中に平均して少なくとも2個のケイ素原子に結合したアルケニル基を含有することを特徴とする。より具体的には、(A)成分は以下の(A-1)成分および(A-2)成分のいずれか1種類またはこれらの混合物であり、さらに、任意で(A-3)アルケニル基含有オルガノポリシロキサン樹脂を含んでもよい。特に、シリコーンゲル硬化物の耐寒性および機械的強度を両立させる見地から、(A-1)成分および(A-2)成分の混合物を用いることが特に好ましい。これらの(A)成分を、後述する(B-1)成分を含む架橋剤を用いて架橋することで、部材内の大きな温度差に起因するクラックがほとんど生じないシリコーンゲル硬化物を形成することができる。
(A-1)成分である分岐状オルガノポリシロキサンは、シリコーンゲル組成物の主剤(ベースポリマー)の一つであり、10~10,000mPa・sの範囲内の粘度を有し、分子中に平均して少なくとも2個のケイ素原子に結合したアルケニル基を含有し、且つ好適には、一定量のRSiO3/2(式中、Rは一価炭化水素基)単位により分岐した構造を有することを特徴とする。
(R3SiO1/2)l(R2SiO2/2)m(RSiO3/2)n (1)
式1中、Rは、一価の炭化水素基を表し、
l、mは、nはそれぞれ1以上の数であり、好ましくはl+m+n+pは200以下である。
(A-2)成分の直鎖状オルガノポリシロキサンは、シリコーンゲル組成物の主剤(ベースポリマー)の一つであり、10~10,000mPa・sの範囲内の粘度を有し、分子中に平均して少なくとも2個のケイ素原子に結合したアルケニル基を含有する。
(R3SiO1/2)p(R2SiO2/2)q (2)
式2中、Rは、上述した(A)成分の一般式(1)における一価の炭化水素基と同じ基を表し、
pおよびqは、それぞれ1以上の整数を表し、好ましくはp+qは500以下である。
(A-3)成分は、分子内に平均して少なくとも2個のアルケニル基を含み、RSiO3/2(式中、Rは一価有機基)で表されるシロキサン単位およびSiO4/2で表されるシロキサン単位から選ばれるシロキサン単位を、全シロキサン単位の少なくとも20モル%以上含有するオルガノポリシロキサン樹脂である。
(B-1)成分の分岐状オルガノハイドロジェンポリシロキサンは、本発明の特徴的な成分の一つであり、上記(A)成分と反応し、本組成物の架橋剤として作用することにより、得られるシリコーンゲル硬化物の耐クラック性(特に部材内部における温度差に起因する内部応力に基づく亀裂・破損等)を効果的に抑制する成分である。こうした分岐状オルガノハイドロジェンポリシロキサンは、2~1000mPa・sの範囲内の粘度を有し、分子中に少なくとも3個のケイ素原子に結合した水素原子を有し、かつ、R´SiO3/2またはSiO4/2で表されるシロキサン単位を全シロキサン単位の少なくとも20モル%以上含有する。
(R´3SiO1/2)q(R´2SiO2/2)r(R´SiO3/2)s(SiO4/2)t(R´´O1/2)u
で表される分岐状オルガノハイドロジェンポリシロキサンである。
(H(CH3)2SiO1/2)l1(SiO4/2)p1
で表される、MHQ樹脂である。ここで、l1+p1=1であり、0.1≦l1≦0.80かつ、0.20≦p1≦0.90であることが好ましい。
(B-2)成分の鎖状オルガノハイドロジェンポリシロキサンは、前述の(B-1)成分とともに上記(A)成分と反応し、本組成物の架橋剤として作用するものである。こうした鎖状オルガノハイドロジェンポリシロキサンは、2~1000mPa・sの範囲内の粘度を有し、2個のケイ素原子に結合した水素原子を有する。
(HR2SiO1/2)2(R2SiO2/2)v (式4)
式4中、Rは、上述した(B-1)成分における脂肪族不飽和炭素結合を有さない炭素原子数1~10の一価炭化水素基と同様の基を表し、工業的見地からは、メチル基またはフェニル基が好ましい。また式中、vは1以上の数であり、好ましくは2+vは500以下である。
(H(Me)2SiO1/2)(Me2SiO2/2)v1(SiO1/2(Me)2H)
で表される分子鎖両末端がジメチルハイドロジェンシロキシ基で封鎖されたジメチルポリシロキサンが例示される。ここで、v1は、25℃における粘度が2.0~500mPa・sの範囲内、より好適には、2.0~150mPa・sの範囲内となる数であり、Meはメチル基である。
HMe2SiO(Ph2SiO)v2SiMe2H
HMePhSiO(Ph2SiO)v2SiMePhH
HMePhSiO(Ph2SiO)v2(MePhSiO) v3SiMePhH
HMePhSiO(Ph2SiO)v2(Me2SiO) v3SiMePhH
成分を併用して、シリコーンゲル組成物全体に占めるケイ素原子に結合したアルケニル基1個当りの、ケイ素原子に結合した水素原子の合計個数が0.7~1.2個中における含有量に調整することにより、耐熱性及び物理的特性に優れるシリコーンゲル硬化物が得られる。(B-2)成分に由来するケイ素原子結合水素原子が、(A)成分中のアルケニル基1.0個に対して前記上限より多い場合は、硬化物の耐熱性が低下する場合がある。また、(B-2)成分を使用しない場合、および前記の使用量の上限を超えると、得られるシリコーンゲル硬化物の硬化性または物理的特性が著しく悪化する場合があり好ましくない。
本発明の(C)成分は、前記(A)成分中のケイ素原子結合アルケニル基と前記(B-1)成分および(B-2)成分中のケイ素原子結合水素原子との付加反応(すなわち、ヒドロシリル化反応のことである)を促進させるための触媒として使用されるものである。こうした(C)成分は白金系(白金または白金を含む化合物)化合物として公知のものを使用することができ、ヒドロシリル化反応の促進効果が高いことから、白金-アルケニルシロキサン錯体が特に好ましく、白金の1,3-ジビニル-1,1,3,3-テトラメチルジシロキサン錯体が特に好ましい。これらのヒドロシリル化反応用触媒は、一種単独で用いてもよいし、二種以上を併用してもよい。また、白金-アルケニルシロキサン錯体の安定性を向上させるため、(C)成分は、アルケニルシロキサンオリゴマーやジメチルシロキサンオリゴマー等のオルガノシロキサンオリゴマーに溶解して使用してもよい。
(D)成分は、本組成物の耐熱性を向上させるために用いられる。こうした(D)成分の反応生成物は、0.5~5.0質量%のセリウム(金属)を含有することが特に好ましい。また、(d1)アルカリ金属シラノレートは、(d1-1)1種類以上の環状オルガノポリシロキサンを(d1-2)アルカリ金属水酸化物により開環反応して得られた反応生成物に、(d1-3)25℃における粘度が10~10000mPa・sの範囲内であるオルガノポリシロキサンをさらに反応させて得られるアルカリ金属シラノレート化合物であることが好ましい。
sおよびtは、それぞれ0~8の整数であり、但し、3≦m+n≦8である。
本発明の組成物には、上記(A)~(D)成分以外にも、本発明の目的を損なわない範囲で任意成分を配合することができる。この任意成分としては、例えば、反応抑制剤、無機質充填剤、ケイ素原子結合水素原子およびケイ素原子結合アルケニル基を含有しないオルガノポリシロキサン、接着付与剤、耐熱性付与剤、難燃性付与剤、チクソ性付与剤、顔料、染料等が挙げられる。
本発明のシリコーンゲル組成物は、上記(A)~(D)成分(任意成分が配合される場合には、任意成分も含む)を常法に準じて混合することにより調製することができる。その際に、混合される成分を必要に応じて2パートまたはそれ以上のパートに分割して混合してもよく、例えば、(A)成分の一部並びに(C)および(D)成分からなるパートと、(A)成分の残部および(B)成分からなるパートとに分割して、それぞれ混合した後、これら2つのパートを混合して調製することもできる。特に、いずれかのパートに、任意成分として前記の反応抑制剤を含むことが好ましい。
シリコーンゲル硬化物は、シリコーンゲルのことであり、本発明のシリコーンゲル組成物を、常温もしくは用途に応じた温度条件下で硬化させることにより調製することができる。このシリコーン組成物の硬化のための温度条件は、特に限定されないが、通常60℃~150℃の範囲内である。
シリコーンゲル硬化物は、200度を超える高温下での耐熱性および透明性に優れ、高温での長期使用によっても低弾性率、低応力および高透明性を維持することができ、且つ高温の熱源をシリコーンゲル硬化物の一面(例えば、底面)のみに設置する場合に代表されるように、シリコーンゲル硬化物の一方向のみが高温にさらされた状態で長時間放置しても、部材内部の温度差及び内部応力に起因してシリコーンゲル硬化物にクラックなどの欠陥が生じにくい特性を有する。さらに、半導体チップ、SiC半導体チップ、IC、ハイブリッドIC、パワーデバイス等の電子部品の保護用途に用いた場合、高温下でも透明性を維持し、耐熱性に優れるので長期耐久性の向上が期待されるだけでなく、低温下でも劣化しにくいので、温度差の激しい過酷な使用条件下であっても高信頼性且つ高耐久性の電子部品を提供できる利点がある。特に、シリコーンゲル硬化物を封止剤等として備える電子部品は、温度差の激しい過酷な使用条件下であっても高信頼性且つ高耐久性を有する。なお、前記の半導体チップには、LED等の発光半導体素子が含まれる。
シリコーンゲル硬化物は、JIS K2220で規定される1/4ちょう度の直読値(読み取りの単位は1/10mm)が10~150の範囲を満たすことが好ましく、20~120の範囲を満たすことがより好ましく、30~100の範囲を満たすことがさらに好ましい。こうした範囲のJIS K2220で規定される1/4ちょう度の直読値を示すシリコーンゲル硬化物は、低弾性率および低応力といったシリコーンゲル硬化物の特徴を有するものになる。この針入度が10より小さい場合には、低弾性率、低応力といったシリコーンゲル硬化物の特徴を発揮することが困難であり、150を超える場合には、シリコーンゲル硬化物としての形態を保持し難く、流動してしまう。なお、「1/4ちょう度の直読値」とは、JIS K2220の1/4ちょう度計を用いて、JIS K2220で規定される1/4コーンによる針入度試験と同様に、試料の表面から1/4コーンを落下させ、このコーンが進入した深さを読み取った値である。
シリコーンゲル硬化物は、実質的に透明である。「実質的に透明」とは、例えば、アルミカップに10mm厚になるようにシリコーンゲル組成物を静かに注いで、その後加熱して厚さ10mmのシリコーンゲル硬化物を調製し、このシリコーンゲル硬化物を上面から目視して、アルミカップの底面を目視できる程度に透明であることを意味する。シリコーンゲル硬化物が、こうした透明性を有することにより、パワーデバイス等の半導体の封止剤等として有用である。
以下の方法で成分Dを合成した。ヘキサメチルシクロトリシロキサンおよびオクタメチルシクロテトラシロキサンの混合物を水酸化カリウムにより開環反応して調製したカリウムシラノレート化合物60gに、粘度20mPa・sの分子鎖両末端トリメチルシロキシ基封鎖ジメチルポリシロキサン120g、およびヘキサメチルホスホアミド0.5gを加えて、窒素気流下、115℃で2時間反応させてカリウムシラノレート化合物を調製した。このカリウムシラノレート化合物100gを150gのイソプロパノールに溶解し、これを撹拌させながら、無水の塩化セリウム2.5g、エタノール50g、及びメタノール50gの混合物を滴下して加えて反応させた。この反応混合物をろ過した後、ろ液を減圧下、40~50℃に加熱してエタノール、メタノールを留去した。次に、これを再度ろ過して、淡黄色液状の反応生成物を調製した。この反応生成物中のセリウム濃度は1.4重量%であった。
本発明のシリコーンゲル組成物の保存安定性、およびシリコーンゲル硬化物の透明性、1/4ちょう度、耐熱性、およびクラック耐性は次のようにして測定した。
50mlのガラスビーカーにビーカーの底から3cmの高さになるまでシリコーンゲル組成物を静かに注いだ後、80℃で1時間加熱してシリコーンゲル硬化物を作製した。このシリコーンゲル硬化物の1/4ちょう度をJIS K 2220に規定された方法により測定した。なお、このシリコーンゲル硬化物の1/4ちょう度は、上述した通り、JIS K2220で規定される1/4ちょう度の直読値(読み取りの単位は1/10mm)である。
上記の方法で硬化させたシリコーンゲル硬化物を、225℃のオーブン中に静置した後、1000時間後に取り出し、室温で25℃まで冷却した。その後、このシリコーンゲル硬化物の1/4ちょう度をJIS K 2220に規定された方法により測定した。なお、このシリコーンゲル硬化物の1/4ちょう度は、上述した通り、JIS K2220で規定される1/4ちょう度の直読値(読み取りの単位は1/10mm)である。
上記の方法で硬化させたシリコーンゲル硬化物を、225℃に加熱したホットプレートの上に静置した後、ビーカー越しにシリコーンゲルの外観の状態の観測を1000時間続けた。1000時間以内に目視にてクラックの発生が確認できた場合、その時間を記録した。
下記の成分を表1に示す組成(重量部)で均一に混合して、16種類のシリコーンゲル組成物を調製した。これらのシリコーンゲル組成物を、前記したそれぞれの評価方法に記載した方法で硬化させ、得られたシリコーンゲル硬化物の1/4ちょう度、耐熱性、およびクラック耐性を評価し、結果を以下の表1および表2にまとめた。
((CH3)2(CH2=CH)SiO1/2)2((CH3)2SiO2/2)300
で表される、直鎖状の分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.22重量%)
((CH3)2(CH2=CH)SiO1/2)2((CH3)2SiO2/2)250((CH3)(C6H6)SiO2/2)30
両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.18重量%)
((CH3)HSiO1/2)0.67(SiO4/2)0.33
で表される分岐状のポリオルガノシロキサン(ケイ素原子結合水素原子の含有量=0.96重量%)
成分B-2:粘度が16mPa・sである直鎖状の分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン(ケイ素原子結合水素原子の含有量=0.13重量%)
(Me2ViSiO1/2)0.05(Me3SiO1/2)0.39(SiO4/2)0.56(HO1/2)0.02
で表される分岐状ポリオルガノシロキサン(ビニル基の含有量=1.9重量%)
本願実施例1~11においては、得られるシリコーンゲルの耐熱性及び一方向から225℃で長時間加熱した場合の耐クラック性は良好であり、かつ、高温で1000時間経過した後における1/4ちょう度も大きく変化しなかった。
Claims (15)
- (A)25℃における粘度が10~10,000mPa・sの範囲内であり、分子中に平均して少なくとも2個のケイ素原子に結合したアルケニル基を有するオルガノポリシロキサン:100質量部、
(B-1)25℃における粘度が2~1,000mPa・sの範囲内であり、分子中に3個以上のケイ素原子結合水素原子を有し、かつ、R´SiO3/2(式中、R´は一価炭化水素基)またはSiO4/2で表されるシロキサン単位を全シロキサン単位の少なくとも20モル%以上含有する分岐状オルガノハイドロジェンポリシロキサン:組成物全体に占めるケイ素原子に結合したアルケニル基1個当りケイ素原子に結合した水素原子が0.1~0.8個となる量、
(B-2)25℃における粘度が2~1,000mPa・sの範囲内であり、1分子中に2個のケイ素結合水素原子を有する鎖状オルガノハイドロジェンポリシロキサン:組成物全体に占めるケイ素原子に結合したアルケニル基1個当りケイ素原子に結合した水素原子が0~0.9個となる量、
(C)白金系付加反応触媒:白金系金属量が組成物全体に対して0.01~1000ppmの範囲内となる量、および
(D)(d1)アルカリ金属シラノレートと(d2)塩化セリウムおよびセリウムのカルボン酸塩から選ばれる少なくとも1種以上のセリウム塩の反応生成物:0.2~10.0質量部、
を含有してなり、組成物全体に占めるケイ素原子に結合したアルケニル基1個当り(B-1)成分と(B-2)成分のケイ素原子に結合した水素原子の合計個数が0.7~1.2個となる量であるシリコーンゲル組成物。 - (A)成分が以下の
(A―1)分子内に少なくとも2個のケイ素原子に結合したアルケニル基を有する分枝状オルガノポリシロキサン、および
(A―2)25℃における粘度が1.0~10,000mPa・sの範囲内であり、分子中に少なくとも2個のケイ素原子に結合したアルケニル基を有する直鎖状オルガノポリシロキサン、
のいずれかの1種類又は混合物であり、かつ
(B-2)成分が、分子鎖両末端のみにケイ素結合水素原子を有する、25℃における粘度が2~200mPa・sの範囲内にある直鎖状のオルガノハイドロジェンポリシロキサンであることを特徴とする、請求項1に記載のシリコーンゲル組成物。 - 前記(A―1)成分の分岐状オルガノポリシロキサン分子を構成する全シロキサン単位のうち、80.0~99.8モル%がR2SiO2/2単位であり、0.1~10.0モル%がRSiO3/2単位であり、0.1~10.0モル%がR3SiO1/2単位である(前記Rはいずれもケイ素原子に結合した一価の炭化水素基を表す)、請求項1又は2に記載のシリコーンゲル組成物。
- 前記(A―1)成分の、すべての前記ケイ素原子に結合した一価の炭化水素基のうち、0.25~4.00モル%が、ケイ素原子に結合したアルケニル基である、請求項3に記載のシリコーンゲル組成物。
- 前記(D)成分が、該(D)成分中に0.5~5.0質量%の金属セリウムを含有する、請求項1~4のいずれか1項に記載のシリコーンゲル組成物。
- 前記(d1)成分が、(d1-1)1種類以上の環状オルガノポリシロキサンを(d1-2)アルカリ金属水酸化物により開環反応して得られた反応生成物に、(d1-3)25℃における粘度が10~10000mPa・sであるオルガノポリシロキサンをさらに反応させて得たアルカリ金属シラノレート化合物である、請求項1~5のいずれか1項に記載のシリコーンゲル組成物。
- 前記(D)成分の配合量が、組成物全体に対して、(D)成分中のセリウム金属含有量が0.005~0.15質量%となる量である、請求項1~6のいずれか1項に記載のシリコーンゲル組成物。
- 請求項1~7のいずれか1項に記載のシリコーンゲル組成物を硬化させてなる、シリコーンゲル硬化物。
- 実質的に透明であり、JIS K2220で規定される1/4ちょう度の直読値が10~150の範囲内である、請求項8に記載のシリコーンゲル硬化物。
- 請求項1~7のいずれか1項に記載のシリコーンゲル組成物を含む、電子部品封止剤。
- 実質的に透明なパワーデバイス用封止剤である、請求項10に記載の電子部品封止剤。
- 請求項8若しくは9に記載のシリコーンゲル硬化物を備えた電子部品。
- パワーデバイスである、請求項12に記載の電子部品。
- 請求項8若しくは9に記載のシリコーンゲル硬化物により光半導体素子が封止された構造を有する、光半導体装置。
- 請求項8若しくは9に記載のシリコーンゲル硬化物を備えた一般照明器具、光学部材または光電子部材。
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| WO2025075151A1 (ja) * | 2023-10-05 | 2025-04-10 | ダウ・東レ株式会社 | 耐熱性シリコーンゲル形成性組成物およびその用途 |
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| WO2014192969A1 (ja) * | 2013-05-29 | 2014-12-04 | 東レ・ダウコーニング株式会社 | 半導体装置および半導体素子封止用硬化性シリコーン組成物 |
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| WO2016136243A1 (ja) * | 2015-02-25 | 2016-09-01 | 東レ・ダウコーニング株式会社 | 硬化性粒状シリコーン組成物、およびその製造方法 |
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| JP3544092B2 (ja) * | 1997-01-31 | 2004-07-21 | 東レ・ダウコーニング・シリコーン株式会社 | 高電圧電気絶縁部品用液状シリコーンゴム組成物およびその製造方法 |
| CN109689791B (zh) * | 2016-08-08 | 2022-09-16 | 道康宁东丽株式会社 | 固化性粒状硅组合物、由其构成的半导体用构件及其成型方法 |
| JP6754317B2 (ja) * | 2017-04-27 | 2020-09-09 | 信越化学工業株式会社 | 付加硬化型シリコーン組成物、該組成物の製造方法、シリコーン硬化物、及び光学素子 |
| JP6923475B2 (ja) * | 2018-03-23 | 2021-08-18 | 信越化学工業株式会社 | 付加硬化型シリコーン組成物、シリコーン硬化物、及び光半導体装置 |
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- 2020-07-13 CN CN202080102014.8A patent/CN115885015B/zh active Active
- 2020-07-13 WO PCT/JP2020/027250 patent/WO2022013917A1/ja not_active Ceased
- 2020-07-13 KR KR1020237004382A patent/KR20230037595A/ko active Pending
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| WO2024121942A1 (ja) * | 2022-12-06 | 2024-06-13 | ダウ・東レ株式会社 | オルガノポリシロキサン組成物、その硬化物、電子部品封止剤、電子部品、および半導体チップの保護方法 |
| WO2025075151A1 (ja) * | 2023-10-05 | 2025-04-10 | ダウ・東レ株式会社 | 耐熱性シリコーンゲル形成性組成物およびその用途 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230250284A1 (en) | 2023-08-10 |
| EP4181183B1 (en) | 2025-12-03 |
| CN115885015A (zh) | 2023-03-31 |
| CN115885015B (zh) | 2024-04-05 |
| EP4181183A4 (en) | 2024-08-21 |
| KR20230037595A (ko) | 2023-03-16 |
| EP4181183A1 (en) | 2023-05-17 |
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